RH6.2 Partitions

[Grigory Pendler]

Maybe this one is out of topic, but I'm 
trying for two days, and I never seen that before
Redhat manuals are not helping 

I have 13.2G Seagate ST313032A HD 
80% percent is in use by windows partitions.
When partitioning during Linux installation
I can create some file systems (/usr, /home etc.)
But when trying to create / or /boot i get
them in red color and it says "Boot Partition is too big..."

Is there a way to solve this?

Thanks 
        Greg